111 lines
3.0 KiB
Bash
111 lines
3.0 KiB
Bash
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#! /bin/bash
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#
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# This is used to initially create /var/lib/machines subvolume in case
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# the system we're running on is using BTRFS with the specific layout
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# used by snapper to perform snapshots, rollbacks, etc...
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#
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# Unfortunately some distros (TW) already shipped versions with
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# systemd creating a plain subvolume which breaks snapper.
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#
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# If /var/lib/machines is already populated then it's going to be
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# pretty ugly to convert the old subvolume into a new one specially
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# since it can be in use.
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#
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# Hopefully not a lot of users are using machinectl to import
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# container/VM images. So in most of the cases this directory should
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# be empty and we can then simple delete the subvolume and create a
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# new one respecting the snapper layout.
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#
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# In the rare case where /var/lib/machines is populated, we will warn
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# the user and let him fix it manually.
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#
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# In order to avoid ugly dependencies added in systemd package, this
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# script should only be called during package updates when
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# mksubvolume(8) is available. During installation, /var/lib/machines
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# is supposed to be created by the installer now.
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#
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# See bsc#992573
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#
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warn() {
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echo >&2 "warning: $@"
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}
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is_btrfs_subvolume() {
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# On btrfs subvolumes always have the inode 256
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test $(stat --format=%i "$1") -eq 256
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}
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# This assumes the directory/subvol is emptied by the caller.
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rm_subvolume_or_directory() {
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is_btrfs_subvolume "$1" && {
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btrfs subvolume delete "$1"
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return
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}
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rmdir "$1"
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}
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on_exit() {
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# Simply print a common error message in case something went
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# wrong.
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if test $? -ne 0; then
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warn "Please fix /var/lib/machines manually."
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# FIXME: point to a documentation explaining how to do
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# that.
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exit 1
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fi
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}
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#
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# If something is already mounted don't try to fix anything, the
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# subvolume has already been created by either mksubvolume(8) or by
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# the admin. In the later case we don't want to screw up his setup.
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#
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if mountpoint -q /var/lib/machines; then
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exit
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fi
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#
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# Let's try to figure out if the current filesystem uses a Snapper
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# BTRFS specific layout. Note that TW uses a different layout than
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# SLE...
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#
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# FIXME: not sure if it's correct, reliable or optimal.
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#
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case $(findmnt -nr -t btrfs -o FSROOT / 2>/dev/null) in
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*.snapshots/*/snapshot*)
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;;
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*)
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exit 0
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esac
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trap on_exit EXIT
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if test -d /var/lib/machines; then
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#
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# Ok, we're on a system supporting rollbacks and
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# /var/lib/machines is not a subvolume remotely mounted so it
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# cannot be suitable for systems supporting rollback. Fix it.
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#
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echo "Making /var/lib/machines suitable for rollbacks..."
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type mksubvolume >/dev/null 2>&1 || {
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warn "mksubvolume(8) is not installed, aborting."
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exit 1
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}
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test "$(ls -A /var/lib/machines/)" && {
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warn "/var/lib/machines is not empty, aborting."
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exit 1
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}
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echo "Deleting empty /var/lib/machines directory/subvolume"
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rm_subvolume_or_directory /var/lib/machines || {
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warn "fail to delete /var/lib/machines"
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exit 1
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}
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fi
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# At this point /var/lib/machines shouldn't exist.
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echo "Creating /var/lib/machines subvolume suitable for rollbacks."
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mksubvolume /var/lib/machines
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